At Great Falls, near McLean, Virginia, the Potomac River builds up speed and force as it plunges over a series of steep, jagged rocks and flows through the narrow Mather Gorge. It’s considered so dangerous, that ironically the National Park Service warns, “Swimming, wading, and entering the river in any manner are prohibited year round. Dangerous currents, rocks, and rapids make the river extremely hazardous.” Here’s an adrenaline junkie running a rocky kayak ride at Great Falls Park. Photo #1 by O Palsson